US4361723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated high voltage cables
Assignee: Hubbell Inc
•
Filing: 1981-03-16
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Granted: 1982-11-30
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Expires: 2001-03-16
Abstract
Abstract There is provided an insulated high voltage cable which possesses the property of lower dielectric losses than prior art cables. The cable comprises a conductor insulated with at least two laminar layers of insulating material. At least one of the layers is relatively thick and has a low SIC. At least one other of the layers has a high SIC and is in contact with a surface of the low SIC layer. The high SIC layer is relatively thin and has a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Inventors
- 👤 Andrew Hvizd, Jr.
- 👤 Richard T. Pye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:42
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/027; Y; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/26; Y10S174/27; Y10S174/28; Y10S174/31
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
An insulated high voltage cable comprising a conductor insulated with at least two laminar layers of insulating material, at least one of said layers being relatively thick and having a low SIC of no greater than 4.5, at least one other of said layers having a high SIC of 7 or more and being in contact and interfacing with a surface of said low SIC layer, said high SIC layer being relatively thin and having a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Claim 2
Dependent Claim
92 words
An insulated high voltage cable comprising a conductor insulated with at least two laminar layers of insulating material, at least one of said layers being relatively thick and having a low SIC of no greater than 4.5, at least one other of said layers having a high SIC of 7 or more and being in contact and interfacing with a surface of said low SIC layer, said high SIC layer being relatively thin and having a tan δ/SIC value no greater than 0.005 over a temperature range of 40° to 90° C.
Claim 3
Dependent Claim
41 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a thin layer of high SIC material, a thick layer of low SIC material, a layer of semiconducting material and a layer of conductive material.
Claim 4
Dependent Claim
48 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a layer of semiconducting material, a thin layer of said high SIC material, a thick layer of said low SIC material, a layer of semiconducting material and a layer of conductive material.
Claim 5
Dependent Claim
57 words
A cable as defined in claim 1 wherein said conductor is coated with successive layers comprising a thin layer of said high SIC material, a thick layer of said low SIC material, a thin layer of high SIC material having an SIC of 7 or greater, a layer of semiconducting material and a layer of conductive material.
Claim 6
Dependent Claim
44 words
A cable as defined in claim 1 wherein the SIC of the thick low SIC layer is in the range about 2 to about 4.5 and the SIC of the thin high SIC layer is in the range of about 7 to about 1500.
Claim 7
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thick layer of insulation is crosslinked.
Claim 8
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thick layer of insulation is thermoplastic.
Claim 9
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thin layer of insulation is crosslinked.
Claim 10
Dependent Claim
15 words
A cable as defined in claim 5 wherein the thin layer of insulation is thermoplastic.
Claim 11
Dependent Claim
21 words
A cable as defined in claims 1 or 2 wherein said thin layer of insulation is less than 50 mils thick.
Claim 12
Dependent Claim
24 words
A cable as defined in claim 4 wherein the second recited thin layer of high SIC material is no greater than 100 mils thick.
References Cited (Backward Citations)
US3287489A
Cited
US3433891A
Cited
US3828115A
Cited
US4032381A
Cited
US3885085A
Cited
US4079191A
Cited
US4132858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |